package com.ada.guava;

import com.google.common.base.Preconditions;

/**
 * Created by ada on 2017/5/8.
 */
public class PreconditionsApp {
    public static void main(String[] args) {
        int count=-1;
        Preconditions.checkArgument(count > 0, "must be positive: %s", count);
    }
}
